Bad customer service and no communication

I have cancelled a contract in 2019 May it was my focussed investment plan and cancellation was confirmed by old mutual on the 17th of September 2019 and my lump sum of my investment paid out to my bank account.

However deductions were still taking place and The last refund was processed on the 1st of July 2020 but deductions on my salary were still taking place up until the December of 2020 but to date i have been refunded the balance of this Months. I’ve been sending mails with proof of deductions to their complaints department email and no one is replying back to me . I really feel I need to get my money back as the policy has been canceled.